Sanrensei simplest comments

  Difficulty: Beginner   Keywords: Opening

Some very basic remarks about sanrensei.

3-3 invasion

[Diagram]

Which side to block



If White invades directly at 3-3, Black should definitely block as shown.

[Diagram]

Continuation



Black can be quite content with the standard sequence here. The BC stone is looking better and better placed.

Diagonal attachment

[Diagram]

White approaches inside



For White to play an approach inside the sanrensei is somewhat better than the immediate invasion (except in cases where White's take on the framework theory of the overall position is that making one group live quickly is a good idea). If there is a chance to play at a instead that is typically even better.

[Diagram]

Black's diagonal attachment



Now Black almost always plays the diagonal attachment, to set up an attack. This is the correct way to use BC. White's most reasonable continuations are at b and c, to form a small base.


See also:


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